PEAK BlueDEF Diesel Exhaust Fluid is a high-purity blend of synthetic urea and deionized water, specifically formulated for use in all diesel vehicles with Selective Catalytic Reduction (SCR) systems. It helps reduce harmful nitrogen oxide emissions by converting them into nitrogen and water vapor, promoting cleaner exhaust and improved engine performance. Certified by the American Petroleum Institute, BlueDEF guarantees purity and quality to prevent system failures and keep your diesel vehicle running smoothly. With its non-toxic, non-flammable formula and a convenient vented nozzle for easy pouring, BlueDEF offers safe and effective performance.